How to set nomad tmpfs bind mount to "exec"?

Nomad
1

What is the Nomad equivalent of docker run --rm -it --tmpfs /mytmp:exec?
I have a tmpfs mount like the below, but how do I set exec/noexec?

        mount {
          type     = "tmpfs"
          target   = "/mytmp"
          readonly = false
          tmpfs_options {
            size = 100000 # size in bytes
          }
        }